A hair transplant in Singapore is around $5-$7. It varies for every clinic where you have it done and the surgeon who will perform the procedure. In Thailand you can get it at around $3-$5. But you should never make your decision based on price alone. Do your homework and check for the quality of results that a particular clinic or surgeon is known to produce. The price may be a major factor but dont't let it be your priority by opting for a cheaper one but undermining results. Know hoe how to find the most value for your money with hair transplants that priced at a reasonable cost. I actually found this article that you might find helpful: Singapore Aesthetic and Hair Transplant Clinic: Hair Transplant Cost in Singapore
good luck on your search!